Granted Patent
Utility
US 4,398,588 · App. 06/230,191
Method of making a rim-stabilized steel ingot
Inventors:
Paul E. Hamill, Jr., Robert H. Kachik
Patented Case
View Patent ↗
Granted: Aug 16, 1983
Filed: Feb 2, 1981
Inventors
Paul E. Hamill, Jr.
Robert H. Kachik
Assignee (at issue)
United States Steel Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.